Freescale Semiconductor, Inc. OSDAUG
OpenSDA
User's Guide
2012-09-18
Rev. 0.93
OSDAUG OpenSDA User's Guide Page 2 of 9
Table of Contents
1 Overview ..................................................................................................................................................... 3
1.1 OpenSDA Hardware ........................................................................................................................................................... 3
1.2 OpenSDA Software ............................................................................................................................................................. 4
1.2.1 MSD Bootloader .................................................................................................................................................................................. 4
1.2.2 P&E Debug Application ................................................................................................................................................................... 5
1.2.3 MSD Flash Programmer .................................................................................................................................................................. 6
1.2.4 USB Communications Device Class (CDC) .............................................................................................................................. 7
2 Getting Started with OpenSDA ............................................................................................................ 7
2.1 Getting into Bootloader Mode ....................................................................................................................................... 7
2.2 Loading an OpenSDA Application ................................................................................................................................ 8
2.3 Using the MSD Flash Programmer ............................................................................................................................... 8
3 LED Status Indicator ............................................................................................................................... 8
OSDAUG OpenSDA User's Guide Page 3 of 9
1 Overview
OpenSDA is an open-standard serial and debug adapter. It bridges serial and debug communications
between a USB host and an embedded target processor as shown in Figure 1. The hardware circuit is
based on a Freescale Kinetis K20 family microcontroller (MCU) with 128 KB of embedded flash and an
integrated USB controller. OpenSDA features a mass storage device (MSD) bootloader, which provides
a quick and easy mechanism for loading different OpenSDA Applications such as flash programmers,
run-control debug interfaces, serial-to-USB converters, and more.
This document provides information required to operate OpenSDA. Information on how to integrate
OpenSDA into a custom hardware design and how to create custom OpenSDA applications can be
found in the OpenSDA Developer’s Guide (available October 2012).
Figure 1. OpenSDA High-Level Block Diagram
1.1 OpenSDA Hardware
OpenSDA is managed by a Kinetis K20 MCU built on the ARM® Cortex™-M4 core. The Kinetis K20
includes an integrated USB controller that can operate at clock rates up to 50MHz. The OpenSDA
circuit includes, at a minimum, a status LED and a pushbutton. The pushbutton asserts the Reset signal
to the target processor, which could be a microcontroller, digital signal controller, or a microprocessor.
It can also be used to place the OpenSDA circuit into Bootloader mode. SPI and GPIO signals provide
an interface to either a JTAG or an SWD debug port on a target processor. Additionally, signal
connections are available to implement a UART serial channel. The OpenSDA circuit receives power
when plugged into a USB Host. In some designs, the OpenSDA circuit can also control the power
supply of the target processor.
OSDAUG OpenSDA User's Guide Page 4 of 9
1.2 OpenSDA Software
OpenSDA software includes a flash-resident USB MSD Bootloader and a collection of OpenSDA
Applications. The MSD Bootloader is consistent across all implementations of OpenSDA, but the
available OpenSDA Applications may vary from one hardware system to another. The following
sections describe the MSD Bootloader and the standard OpenSDA Applications provided by Freescale:
the P&E Debug Application and the MSD Flash Programmer.
1.2.1 MSD Bootloader
The OpenSDA MSD Bootloader provides a simple interface for loading an OpenSDA Application into the
OpenSDA processor’s non-volatile memory. Only one OpenSDA Application may be resident at a time,
and this application will be automatically run at startup unless Bootloader mode is selected by holding
down the Reset button while plugging in a USB cable.
The MSD Bootloader appears in the host file system as a removable drive with a volume label of
“BOOTLOADER”, as Figure 2 shows. An OpenSDA Application is loaded by simply dragging and dropping
an OpenSDA Application file onto the BOOTLOADER drive, which implements a pseudo-FAT16 file
system. OpenSDA Applications can be in S-record, raw binary file, or an encrypted .SDA file formats.
Status information is provided through a text file named LASTSTAT.TXT.
Figure 2. MSD Bootloader File List Shown in Windows Explorer on Windows 7
Figure 2 shows the files listed in a typical OpenSDA Bootloader. All files are readable as text files. The
*.HTM files execute links to live web pages and, if executed, will open the default browser and load
the specified web page. Table 1 summarizes the files in the MSD Bootloader and MSD Flash
Programmer removable drives.
Table 1. OpenSDA Mass Storage Device File List
Filename
Description
LASTSTAT.TXT
The text in this file reflects the latest status information from the previous
operation. If no operation has been performed, the contents of the file will be
“Ready.”. Following a successful application update operation, the contents will
read “Completed.”.
FSL_WEB.HTM
Link to the primary hardware development tool’s web site on freescale.com
TOOLS.HTM
Link to additional software and hardware tools available for Freescale products
OSDAUG OpenSDA User's Guide Page 5 of 9
SDA_INFO.HTM
Link to the OpenSDA web page that contains the latest documentation, software
drivers, and OpenSDA Applications available from P&E Microcomputer Systems
Embedded in this file are id-value pairs that provide detailed information about the
hardware:
ID Tag
Description
BOARD
Board name (e.g. FRDM-KL25Z)
BOOTVER
Bootloader version
APPNAME
Installed application
APPVER
Application version
These values will be available on the web page and they can also be read directly
from the SDA_INFO.HTM file contents.
SERCD89.INF
SERCD89.CAT
These files are Windows driver files for the USB CDC serial communications port
built into the MSD Flash Programmer OpenSDA Application and appear in the root
directory of that Application. These files are available in the MSD Flash Programmer
drive, but not in the BOOTLOADER drive.
Note: Some operating systems cache the files on the BOOTLOADER drive. Because of this, files that
were copied to the OpenSDA Bootloader drive may be seen in the file system even though they are not
stored to the non-volatile flash memory of the OpenSDA controller. These files will no longer appear
once power has been cycled to the OpenSDA device.
1.2.2 P&E Debug Application
The P&E Debug Application is an OpenSDA Application that provides debugging and a virtual serial port
all in one application. It provides a run-control debug interface that controls the JTAG or SWD debug
interface to the target processor. It also provides a USB communications device class (CDC) interface
that bridges serial communications between the USB Host and a UART serial interface on the target
processor. Several integrated development environments support the P&E Debug Application including
CodeWarrior for Microcontrollers (v10.3 and later), IAR Embedded Workbench (v6.40.3 and later), Keil
MDK (v4.54 w/ P&E patch), as well as software from P&E Microcomputer Systems.
USB Drivers for all P&E Microcomputer Systems debug tools can be found online at
www.pemicro.com/opensda.
The P&E Debug Application is designed to debug the resident target processor in the OpenSDA system
with limited support for off-board devices within the same processor family as the resident target
processor. P&E’s Multilink and Tracelink hardware interfaces provide higher performance and
additional debug features: http://www.pemicro.com/opensda/tools.
OSDAUG OpenSDA User's Guide Page 6 of 9
1.2.3 MSD Flash Programmer
The MSD Flash Programmer offers a very easy and convenient way to program applications into the
flash of the target processor. Like the MSD Bootloader, the MSD Flash Programming Application
emulates a FAT16 file system and enumerates as a mass-storage device. It appears as a removable
drive in the host operating system with a volume label that matches the board name (for example,
FRDM-KL25Z). Raw binary and Motorola S-Record files that are copied to the drive are programmed
directly into the target memory device. This is most often the flash of the target microcontroller, but it
could also be another memory device, such as a serial flash, depending on the specific implementation.
Figure 3. MSD Flash Programmer File List Shown in Windows Explorer on Windows 7
The MSD Flash Programmer is designed to program a specific target configuration. It does not support
verification or configuration and is not recommended as a production programmer. The Cyclone
products from P&E Microcomputer Systems are recommended for production programming. They
provide production programming solutions with many different features and verification options that
are highly configurable: http://www.pemicro.com/opensda/tools.
The MSD Flash Programmer also provides a USB communications device class (CDC) interface that
bridges serial communications between the USB Host and a UART serial interface on the target
processor. The drivers required to install this USB CDC device on a Windows operating system are
embedded within the pseudo file system of the MSD Flash Programmer itself. USB drivers are available
at www.pemicro.com/opensda that can be preinstalled; however, it is not necessary to do so to run
the MSD Flash Programmer. If Windows fails to find the CDC drivers on its own, the OS can be pointed
to the drivers on the MSD Flash Programmer’s removable drive.
Board and flash programming operation status are also available in text files on the removable drive.
The same files that are accessible in the MSD Bootloader are also available in the MSD Flash
Programmer’s removable drive. Figure 3 shows the files available on the FRDM-KL25Z hardware. Refer
to Table 1 for a description of each file.
NOTE: The MSD Flash Programmer currently only operates correctly on Windows operating systems.
However, the USB CDC virtual serial port functions properly in Windows, Linux and Mac operating
systems.
OSDAUG OpenSDA User's Guide Page 7 of 9
1.2.4 USB Communications Device Class (CDC)
Several of the default OpenSDA Applications provided by Freescale, including the MSD Flash
Programmer and the P&E Debug Application, provide a USB Communications Device Class (CDC)
interface that bridges serial communications between the USB Host and a UART serial interface on the
target processor.
With a Windows host operating system, the USB CDC interface will automatically be assigned a COM
number, such as COM10 or COM11. To understand which COM number has been assigned to the unit,
refer to the Windows Device Manager (Start->Run->”mmc devmgmt.msc”) and look in the “Ports”
section. Many free terminal applications, such as Tera Term and PuTTY, are available to send and
receive serial traffic in Windows.
When the USB CDC interface enumerates on the Linux host operating system, it is generally assigned a
tty* hardware identifier. Many free terminal applications, such as minicom, are available to send and
receive serial traffic in Linux. Make sure you have the appropriate permissions in the operating system
to access this port. Drivers, which can be downloaded from http://www.pemicro.com/opensda, help
configure these permissions.
The OpenSDA Applications do not drive the serial transmit pin to the target microcontroller until the
CDC serial port is opened by an application on the host operating system. After that, these pins will be
driven and will remain driven even after the USB CDC serial port is closed.
NOTE: There is a known Windows issue that affects most terminal applications. The virtual COM port
will be removed from the device manager when the USB cable is unplugged even if a terminal
application has the virtual COM port opened. The virtual COM port will not be accessible even after
the virtual serial device is reconnected unless the virtual COM port is released by the application prior
to the reconnection, which may require closing the application first. It is recommended that the
terminal application be closed before the OpenSDA USB cable is unplugged.
2 Getting Started with OpenSDA
Follow these simple steps to interact with an embedded OpenSDA.
2.1 Getting into Bootloader Mode
The Bootloader runs automatically when a powered USB cable is attached to the OpenSDA-compliant
device and immediately executes the installed OpenSDA Application unless forced into Bootloader
mode by the user. To force the device into Bootloader mode, use the following procedure:
1. Unplug the USB cable (if attached).
2. Press and hold the Reset button.
3. Plug in a USB cable from a USB Host to the OpenSDA USB port.
4. Release the RESET/Bootloader button.
5. A removable drive will be visible in the host file system with a volume label of BOOTLOADER.
For more information, double-click the FSL_WEB.HTM link to open the tools pages for the
development system in use and explore the other files embedded in the hardware. See Table 1 for a
description of these files.
OSDAUG OpenSDA User's Guide Page 8 of 9
2.2 Loading an OpenSDA Application
1. Locate the desired OpenSDA Application. Freescale standard OpenSDA Applications may be
downloaded from the web page links provided in the MSD Bootloader or MSD Flash
Programmer removable drives.
2. Enter Bootloader mode by following the instructions in Section 2.1.
3. Drag/drop or copy/paste the desired application to the BOOTLOADER drive.
4. Unplug the USB cable and plug it in again.
5. The OpenSDA application should now be running
2.3 Using the MSD Flash Programmer
1. Load the appropriate version of the MSD Flash Programmer application into the OpenSDA
board as described in Section 2.2. There are many versions of the MSD Flash Programming
application and it is important to choose the version which is specific to the hardware being
programmed.
2. Copy an S-record (commonly a file with .s19 or .srec extension) or a raw/flat binary file
(commonly a file with a .bin extension) to the MSD removable drive with a volume label of
the target hardware (for example, FRDM-KL25Z).
3. If programming is successful, the embedded application executes automatically. Regardless, the
contents of the LASTSTAT.TXT file are updated with the latest status information.
For older versions of the MSD Flash Programmer, it may be necessary to unplug and re-attach the USB
cable before programming another application into the target processor.
3 LED Status Indicator
The OpenSDA LED indicator is used by the MSD Bootloader and the standard OpenSDA Applications to
provide mode and status information. A description of the LED indicator states and patterns is
provided in Table 2.
Table 2. LED Status and Mode Information.
OpenSDA Mode
State Description
LED Pattern
Bootloader
Prior to USB enumeration
Off
Bootloader
Idle – running normally with no
error conditions
Blinking: 500ms on, 500ms off
Bootloader
Error
2 seconds off followed by 8 rapid on/off blinks
Application
Prior to USB enumeration
Off
Application
Running normally with no error
conditions and no USB activity
On
Application
USB activity (for example, MSD
or CDC)
Blinking
Application
Error
2 seconds off followed by 8 rapid on/off blinks
OSDAUG OpenSDA User's Guide Page 9 of 9
How to Reach Us:
Home Page:
freescale.com
Web Support:
freescale.com/support
© Freescale Semiconductor, Inc. 2012. All rights reserved.
OSDAUG
Rev. 0.93
2012-09-18